SPOKANE VALLEY, Wash. — Fire investigators in Spokane Valley are working to determine the causes of multiple fires that broke out over the past week, including several arson cases along the Spokane River.

Spokane Valley Fire Department put out over a dozen fires along a section near the Spokane River over the weekend, all of which were determined to be arson.

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While firefighters worked to extinguish the blazes, fire investigators simultaneously began their work to determine how the fires started and who may have started them.

Fire investigator Ben Reece said investigators track a variety of factors when there's unusual fire activity in a specific area.

"If there's a certain area in Spokane Valley t

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